Steel retainer attachment for rock drills



April 25, 1933.

J. c. CURTIS STEEL RETAINER ATTACHMENT FORROCK DRILLS Filed May 29; 1951 HM. .EJH? lisimhs i J HN C. CUI775 INVENTOR BY M ATTORNEY Eatented Apr. 25, 1933 UNITED STATES a f a om c. vomvrxs, or CLEVELAND, oHro, ,ASSIGNOR TO 3mm CLEVELAND 1300K mm,

LGQMIANY, or CLEVELAND, 101110, A CORPORATION or OHIO STEEL RETAINER ATTACHMENT FOR'ROGK DRILLS Application filed May :29, .1931. "Serial N0. 540,858.

This invention relates broadly to rock .:drills but more part-iculanlyto steel retainer -iattachment for rock drills of the hammer nexcibjectmfthis invention is .to provide a rock drill with :a 1 steel retainer adaptable :to beE-readily' attached to or detached from .lit-he machine.

r Another object-of thisinvention is to pro-' 101-=vide;,a.rockxdrill with. awsteel retainer vhaving 'wremovable' supporting means, thus facilitatin-gathef'xinterchangeabilityz as well as reducingthe replacementrcost of the worn parts.

Another object of \this invention -is to pro- 1' e wide a .steelretainer with a positive locking device -:of :the supporting" shaft within its ---hous'ing,eliminating'thereby: the use ofparts whichrmay become loose from the vibration \caused :by the reciprocation of {the hammer. 520 @theriobje'cts andadvantages more or ?less wancillary tothe foregoing, and -,the manner in"-which the "variousobjects are attained ire- J rside in thespecific constructionand aggroupment': ofmthe elements-peculiar to ithis struc- 1225 ture, as will become --apparent from a more .eeomplete'ex'amination of this specification, w in the :claims of which there are assembled Tice-rtain specific combinations -.of parts and specific constructions indicative of :thescope 5 --arid-wspirit, of the invention.

a lnithedrawingillustratinga p-ractica'lappl'ieationrof the invention:

- ;igure,1 is an elevation-alview partly in section of the front end of a rock drill-hav- 7 -ii I. .7 jugs the invention applied thereto.

E-igum :12 is ea sideelevational view partly section illustratingthedocking deviceof {the retainer. a

i F igurei-liisaan endaeleva-tional-vie'wof the l-parts-shown, in Figure 11;

' Figure' izis: a; cross ;sectional view taken on tthe TllIlQjH in Figure 1, looking in the directionindicated :bythearrows.

T dteferringwoithe drawing, in whichilike ssymbols fdesignate corresponding parts ,thr'oughoutfthe severals views, there, is shown :iiazfrontiheadal'0, *constitutingithe lower por- -i:t'ion1:ofuthecasingtof a percussive rock drill,

M wvhieh 1is provided-zwith a cylindrical bore r1'l,zterminated=.by ashoulder 12,*for1limiting wardly or maintained in engagement withwalls of the bores 26, havetheir'front f-aces :32, manufactured with a rectangular 'slot33;

the penetrationofa bushing 13, snuglyfitted therein. The bushing 13 is internally'shaped to slidably receivethe tool ,implementordrill steel 14;, .engageable therein through :the me dium of the integral shank 15, which is -5 adapted to receive theblowspf the hammer piston (not shown) and has its penetration therein limited by the collar 16, disposed thereon at a suitable distance from its end.

Thevhousing,1Q,;is formed with aprotxiber-I'afi ance 17, provided with an aperture 18, transversally disposedtherein and partly registering or opening Withinthe borell, and is fitted .to slidablyireceivea pin 19, ,wliichlis formed intermediate its ends with :a restricted ,por $3165 .tion 20,, having a concave configuration 21,

similar :and slightly larger than theqfront lheads bore .11. ,Theendsof the .pin. l9, are

protruding from vthe protuberance lfZ, tl1e purpose ofwhich wilLbe explained lateri $117 0 Extending beyond :the forward end ,of the front head 10, .there cis rthe retainer-22, provided with ,a yoke 23,.of :a smallerqintern-al diameter than the :outside diameter of the collar 16 .and :having two parallel arms 24,

which; are terminated by an enlargedporti-on .25, provided with. axtransversaluaperture .26,

fitted to rotatably engage upon ,the protrud- ,ing endsof the pin 19. Adjacenttheenlarged portion 25, the front :head is manufactured with two oppositely disposed cylindrical bores 26,1in parallel alignment with the. axis of the tool and of suitable sizeto slidably receive the plunger 27, having one end terminated with a V shaped edge 28, adaptable" for engagement within the corresponding recesses on detents 29 and '30, formed upon-the :vertical wall of the enlarged portion 25,0f

the arms 24. The plunger 27, is--urgcd roa of a width somewhat greater: than the t hi'ckness of the enlarged arms portion 25, and of a suflicient depth to provide fora reliable aoverla'pping lw the EP P (which ,willbecxplained hereafter. Y i

When assembling the mechanism, the spring and plunger, 31 and 27 may first be introduced within the bores 26. Subsequently, the retainer 22 may be positioned upon the front head 11, with the aperture 18, in axial alignment with the bores 24, and the en larged portion 25, rocked under the walls 34, or within the rectangular slots 33, thus permitting the introduction of the pin 19, therethrough and bringing the restricted concave portion 20, in alignment with the internal wall of the front head bore 11. Subsequently the bushing 13, may be pressed within its respective bore 11. and consequently within the concaved portion 21, as illustrated in Figure 4, thus preventing the removal of the pin 19, from its bore 18. Should it become necessary to replace the pin 19, the bushing 13, will first have to be removed or pressed out before the removal of the pin can take place.

-Whenever it is desired to remove the tool implement or drill steel 14 from the machine, the retainer 20, may be rocked to one side of the collar 16, as illustrated in dot and dash line in Figure 2. In this inoperative position. the retainer will be maintained in place by' the spring pressed plunger 27. engaged within the recess 30; after another drill steel has been inserted into the machine, the retainer may again be rocked to its initial or operative position. It is obvious that it will require a light force to rock the retainer from one position to the other against the tension of the spring 31. However, such a tension is sufiicient to maintain the retainer in its operative position against the vibration caused by the reciprocation of the hammer. The walls 34, overlapping the retainer arms or enlarged portion 25, will prevent any possible distortion or spreading of the retainer arms, when the drill steel collar 16, accidently hits the yoke 23, or when a steel is removed from a drilled hole.

Although the foregoing description is necessarily of a detailed character. in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various arrangements of parts and modification of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. A drill retainer comprising in combinabore, a removable bushing within said bore fitted to slidably receive a tool implement, a pin within said front head maintained therein by its engagement with said bushing, and a retainer having arms pivotally mounted upon said pin.

3. A tool retainer for rock drills comprising in combination a front head, a pin within said front head having intermediate its ends a restricted portion, a removable bushing within said front head fitted to slidably receive a tool implement, said bushing extending within said restricted portion to hold said pin within said front head, and a retainer having arms pivotally mounted upon said pin.

4. A tool retainer for rock drills comprising in combination a front head, a pin within said front head having intermediate its ends a restricted portion, a removable bushing within said front head fitted to slidably receive a tool implement, said bushing extending within said restricted portion to hold said pin within said front head, a retainer having arms pivotally mounted upon said pin, and means integral with said front head for preventing the spreading of said arms.

5. A tool retainer for rock drills comprising in combination a front head, a pin Within said front head having intermediate its ends a restricted portion, a removable bushing within said front head fitted to slidably receive a tool implement, said bushing extending within said restricted portion to hold said pin within said front head, a retainer having arms pivotally mounted upon said pin, and means for preventing the spreading of said arms, said means comprising a slot within said front head, having the wall there of overlapping said arms.

6. A tool retainer for rock drills comprising in combination a front head, a pin transversally of saidfront head and maintained therein by its engagement with a bushing re movably fitted within said front head, a bore within said bushing capable to slidably receive a tool implement, and a tool retainer pivotally mounted upon the outer end portions of said pin.

7 A tool retainer for rock drills comprising in combination a front head, an aperture within said front head, a pin within said aperture, a removable bushing Within said front head fitted to slidably receive a tool implement, said pin being associated with said bushing to prevent the removal of the former from said aperture, and a retainer having arms pivotally engaging said pin.

8. A tool retainer for rock drills comprising in combination, a front head, a member transversally disposed within said front head forming a pair of trunnions, a removable bushing within said front head fitted to slidably receive a tool implement, means within said member associated with said bushing to hold said trunnionswithin said front head, and a tool retainer having arms supported by and pivotally mounted upon said trunnions.

9. A tool retainer for rock drills comprising in combination a front head having trunnions protruding therefrom, a removable bushing within said front head fitted to slidably receive a tool implement, means associated with said bushing for preventing the removal 19 of said trunnions from said front head, and a tool retainer having arms pivotally mounted upon said trunnions.

In testimony whereof I hereunto afiix mv signature this 28 day of May, 1931. 5 JOHN C. CURTIS. 

